You could also add the missing use statement for the HttpKernel component (see#5556 (comment)).

That was the original reason for doing this PR, but it turns out it isn't missing. It's included in a previous chapter or code example.

I see, but then we should imo add// ... placeholders where they are needed in that file.

Then we need to do it for 99% of the examples (as it's a tutorial, all code examples are an improvement of the previous shown example)

Hm, you're right. I think we can keep it as is then.

PR updated and ready imo

Thanks Wouter! The only thing I wonder about (and it was done this way before), is if we're going to use full namespaces for classes instead of use statements, why not prefix them with their opening \ so that they'll work even if someone copies some of this code into a namespaced file. What do you think about that?